Materials Literature
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An explanation of frictional electrification is suggested and experimentally proved. Because of the presence of structural imperfections, solid insulators are not electrically neutral. Under normal conditions the 'intrinsic' electric field of an insulator is compensated for by ions absorbed from air. Friction of one b…
Measurements of the spin-lattice relaxation rates in the group-III-V compounds, GaAs, GaSb, InAs, and InSb, are presented as a function of temperature from 4 to 300 K. These rates, except for GaSb, are separated into magnetic and quadrupolar parts. The quadrupolar rates are separated into relaxation by acoustic phonon…
The Brillouin spectra of the ferroelectric triglycine sulfate (TGS) and its isomorphous selenate (TGSe) crystals have been observed in three cases of orientations of the longitudinal or quasi-longitudinal phonon vector q ; (1) q // c -axis, (2) q // b -axis and (3) q deviates 5° from b -axis in the (100) plane. The te…
Abstract In the second part of this paper on the kinetics of crystallization of aluminum trihydroxide from caustic aluminate solutions, interest is specially focused on the analysis of crystal size distribution as a function of time, in an isothermal batch crystallizer. Breakdown and agglomeration are shown to affect…
In this paper methods and results of three-dimensional electron microscopy of individual molecules will be presented. Part I describes the general experimental and theoretical methods (microgoniometer, measuring scheme, two-dimensional and three-dimensional reconstruction, determination of the common origin of the pro…
The effect of changes in pH and the presence of ligands on the uptake of copper ions by an illite and a montmorillonite type clay has been investigated. The observed adsorption behaviour on montmorillonite can be interpreted in terms of an ion exchange model, i.e. all positively charged solution species compete for av…
Calculations of the vibrational spectra of continuous random network models of tetrahedrally bonded amorphous semiconductors are presented. Nearest neighbour central and non-central force constants are used. The results show that the shape of the TO-like peak of the spectrum depends on both the topology and bondangle…
Electrical conductivity and thermopower measurements on single crystals of Pt(NH3)4PtCl4 (MGS) and (TTF) NiS4C4H4 (TTF = tetrathiafulvalene) illustrate the application of electrical property measurements to the study of intermolecular interactions and electronic structure in planar metal complex systems. MGS is an ani…
High-energy oxygen ions (400 keV <E<3.6 MeV) are used to obtain a semi-insulating (SI) layer. Our objective is to determine the location of the above-mentionned SI layer in the substrate and its thickness, on one hand, and the influence of the carrier concentration and that of the doping impurity on the…
Direct measurement of the solubility of calcite in seawater is difficult and irreproducible because of kinetic factors that inhibit the attainment of true, reversible equilibrium. To avoid this problem, the solubility product constant for calcite in seawater was determined in the present study by calculation from new…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTYield and decay of the hydrated electron from 100 ps to 3 nsC. D. Jonah, M. S. Matheson, J. R. Miller, and E. J. HartCite this: J. Phys. Chem. 1976, 80, 12, 1267–1270Publication Date (Print):June 1, 1976Publication History Published online1 May 2002Published inissue 1 June 1976h…
The electrochemical properties of a pure liquid crystal are presented which lead to the conclusion that the nonreversible liquid crystal oxidation is the main cause of degradation in dc-driven devices. This phenomena is avoided by the use of electroactive dopants which fulfill the conditions established in Paper I. It…
In the tinplate food container it is to be desired that tin is the sacrificial member of the couple, conferring protection to the steel base while corroding at a slow rate itself. This is the case in many food products, including a large group of acid food products typified by the acid fruits. This is an important pac…
I n-situ x-ray data has been obtained on 99.99% pure cerium at 50 and 52 kbar with the use of a Bragg-Brentano parafocusing x-ray reflection technique under quasihydrostatic conditions, with a thermal cycling procedure. Our results, based upon 22 experimental diffraction lines, indicate that cerium metal exhibits a de…
Radiation degradation of cellulose fibers was investigated by gel permeation chromatography (GPC). Scoured cotton of Mexican variety (cellulose I), Polynosic rayon (cellulose II), and their microcrystalline celluloses obtained by hydrolysis of the original fibers were irradiated by Co-60 γ-rays under vacuum or humid c…
A number of hydrogel systems have demonstrated good tissue compatibility and low thrombogenicity in in vivo and in vitro tests ( 1 ). The poor mechanical properties of hydrogels have encouraged the development of techniques for reinforcing hydrogels to make them suitable for use in biomedical devices. By radiation gra…
A high-intensity ultrasonic apparatus was utilized to study the variation with strain amplitude ε of internal friction Q−1 and modulus defect ΔS/S in α-brass, as influenced by composition, grain size, and prestress. Q−1(ε) manifests three regions: I, where Q−1 is independent of ε; II, where Q−1 rises and then levels o…
Abstract Several formulations are available for the interpretation of reversed refraction profiles in terms of any number of plane dipping layers. Split-spread profiles can be interpreted using the same methods. This procedure requires that the intercept times at the origin from data in opposite directions be equal. I…
The antitumor effect of reserve polysaccharide, paramylon, from Euglena gracilis on the transplantable sarcoma-180 was examined in mice. This polysaccharide had an effect similar to that of lentinan. Paramylon, in a dose of 1 mug/g body weight, injected intraperitoneally 24 hr after tumor implantation had an inhibitor…
(1976). The Air-permeability of Non-woven Fabrics. The Journal of The Textile Institute: Vol. 67, No. 6, pp. 220-224.